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Chitosan-based ion-imprinted cryo-composites with excellent selectivity for copper ions.
- Source :
-
Carbohydrate polymers [Carbohydr Polym] 2018 Apr 15; Vol. 186, pp. 140-149. Date of Electronic Publication: 2018 Jan 31. - Publication Year :
- 2018
-
Abstract
- An original strategy is proposed here to design chitosan-based ion-imprinted cryo-composites (II-CCs) with pre-organized recognition sites and tailored porous structure by combining ion-imprinting and ice-templating techniques. The cryo-composites showed a tube-like porous morphology with interconnected parallel micro-channels, the distance between the channel walls being around 15 μm. Both the entrapment of a natural zeolite and the presence of carboxylate groups, generated by partial hydrolysis of amide moieties, led to II-CCs with controlled swelling ratios (25-40 g/g, depending on pH) and enhanced overall chelating efficiency (260 mg Cu <superscript>2+</superscript> /g composite). To point out the importance of introducing Cu <superscript>2+</superscript> recognition sites, sorption experiments using mixtures of Cu <superscript>2+</superscript> and other competing ions (Co <superscript>2+</superscript> , Ni <superscript>2+</superscript> , Zn <superscript>2+</superscript> or/and Pb <superscript>2+</superscript> ) were also carried out. The higher values of selectivity coefficients obtained for the II-CCs compared to those of non-imprinted ones highlight the remarkable potential of our sorbents for decontamination of wastewaters and recycling of Cu <superscript>2+</superscript> ions.<br /> (Copyright © 2018 Elsevier Ltd. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1879-1344
- Volume :
- 186
- Database :
- MEDLINE
- Journal :
- Carbohydrate polymers
- Publication Type :
- Academic Journal
- Accession number :
- 29455971
- Full Text :
- https://doi.org/10.1016/j.carbpol.2018.01.033